CN105180202B - One kind pumping controllable type rotary air preheater and its adjusting method - Google Patents
One kind pumping controllable type rotary air preheater and its adjusting method Download PDFInfo
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- CN105180202B CN105180202B CN201510406414.9A CN201510406414A CN105180202B CN 105180202 B CN105180202 B CN 105180202B CN 201510406414 A CN201510406414 A CN 201510406414A CN 105180202 B CN105180202 B CN 105180202B
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- 238000005086 pumping Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000007789 sealing Methods 0.000 claims abstract description 55
- 239000007789 gas Substances 0.000 claims abstract description 30
- 230000000740 bleeding effect Effects 0.000 claims abstract description 17
- 239000003517 fume Substances 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims description 76
- 239000001301 oxygen Substances 0.000 claims description 61
- 229910052760 oxygen Inorganic materials 0.000 claims description 61
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 60
- 238000005259 measurement Methods 0.000 claims description 41
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 24
- 239000003546 flue gas Substances 0.000 claims description 24
- 238000009530 blood pressure measurement Methods 0.000 claims description 16
- 238000005260 corrosion Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 239000003245 coal Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000012802 pre-warming Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Control Of Positive-Displacement Air Blowers (AREA)
- Air Supply (AREA)
Abstract
One kind pumping controllable type rotary air preheater and its adjusting method, the preheater include shell, exhaust gases passes, air duct, rotor, sealing plate, diaphragm seal, extract system and control system；Extract system includes at least one bleeding point, at least one call prisoners in after letting them out for exercise case and at least one pumping blower fan installed in sealing plate coenvelope bleeding point being arranged at least one sealing plate；Pressure-measuring-point, exhaust gas temperature measuring point, air temperature measuring point, flow rate adjusting mechanism, hot air duct flow control valve and cold air duct flow control valve at control system pressure-measuring-point containing fume side, sealing.The present invention is according to pressure-measuring-point at sealing and the pressure difference and exhaust gas temperature and air temperature of fume side pressure-measuring-point, the hot air duct and the assignment of traffic of cold air duct utilized by flow control valve adjustment air, ensure air leak rate of air preheater under operation the moment be maintained close to zero operating mode, realize cold snap back-end ductwork anti-corrosion and energy conversion.
Description
Technical field
One kind pumping controllable type rotary air preheater and its adjusting method, it is related to thermal power plant using back-end ductwork heat
Flue gas to cold air turn round the technology of preheating.
Background technology
Energy-saving and emission-reduction have been increasingly becoming the much-talked-about topic that the whole world is paid close attention to the most, improve energy utilization rate, reduce energy resource consumption,
Just like turn into the history important task that all trades and professions researcher is born.And electric power constantly enters as industrial development and social economy
The coal resources of the support industry of step, wherein heat power station consumption account for the half of coal total flow, in energy resource structure
In very important position.
For thermal power generation unit, under conditions of same steam parameter, boiler efficiency is to influence the most pass of unit coal consumption
Key factor.Under the present art, boiler design efficiency is mostly more than 92%, and flue gas loss is still first in its loss of efficiency
When its punching.It is that current thermal power generation unit is universal that heating is carried out to cold air using back-end ductwork heat smoke using air preheater
The technology of use.And rotary regenerative air preheater is because its is compact-sized, the coefficient of heat transfer is high, cost is low etc. that plurality of advantages turns into existing
In the widely used air prewarming device of Large-scale fire-electricity unit.Pass through exhaust gases passes yet with its rotor heat storage plate rotating wheel stream
And air duct, inevitably build-up of pressure of a relatively high air in gap leaks to the relatively low flue gas of pressure between sound part
Wind.Although can substantially reduce air leak rate of air curtain by a variety of Sealing Technologies such as diaphragm seal, the example just applied at present is seen, large-scale fire
The air leak rate of air curtain of group of motors rotary regenerative air preheater is generally between 8~10%.On the one hand so big air leak rate of air curtain causes to send
The rising of blower fan, air-introduced machine power consumption, it is often more important that its Cryogenic air directly mixes with heat smoke, reduces flue gas temperature, subtracts
The small heat transfer temperature and pressure of flue gas and air, influence the pre-heat effect to cold air, while considerably increase the flow of flue gas, are arranging
Cigarette temperature is difficult under conditions of declining, and considerably increases the flue gas loss of boiler, directly affects boiler efficiency.Transported by current boiler
Row flue gas loss generally calculates 140 DEG C or so (equivalent to influence about 6~7% or so to boiler efficiency), and 10% leak out is blunt
Connecing causes boiler exhaust gas loss increase by 0.6~0.7% or so, influences more than unit net coal consumption rate 2g/kW.h.
With increasingly attention of the entire society to energy-saving and emission-reduction in recent years, State-level is put into effect more and more increasingly tighter
Energy-saving and emission-reduction policy, Thermal Power Generation Industry start to try raising machine, stove, auxiliary efficiency from all angles, and reducing, swinging air is pre-
Many advanced technologies should be also born in terms of the air leak rate of air curtain of hot device, such as adjustable Sealing Technology, VN Sealing Technologies, contact seal skill
Art, flexible sealing technology, brush seal technology, self-adapting seal technology etc..By the theory analysis to air-heater leakage,
Interval area between the pressure difference and sound part of diaphragm seal both sides is two most direct factors for influenceing to leak out.It is and existing close
Encapsulation technique is mostly worked in terms of gap trying to reduce at sealing, although obtaining certain effect, due to heating part dynamic
The problems such as deformation, seal member abrasion, can not solve, and its effect can only be temporary transient.In terms of current operational effect, mostly exist
Just dress phase effect it is preferable, run a period of time after with water-tight equipment abrasion, deformation the problems such as it is increasingly severe, air leak rate of air curtain by
Edge up height, can not fundamentally solve the problems, such as air-heater leakage.
The content of the invention
It is an object of the invention to provide one kind pumping controllable type rotary air preheater and its adjusting method, reduced with realizing
The effect of air leak rate of air preheater, and according to pressure-measuring-point at sealing and the pressure difference and exhaust gas temperature of fume side pressure-measuring-point
With the regulation of air temperature, ensure air leak rate of air preheater under operation the moment be maintained close to zero operating mode, and
Realize the control converted in cold snap back-end ductwork anti-corrosion and energy.
Technical scheme is as follows：
One kind pumping controllable type rotary air preheater, described air preheater include shell, exhaust gases passes, air and led to
Road, rotor, sealing plate and diaphragm seal, it is characterised in that：The rotary air preheater also includes extract system and control system, institute
State extract system include be arranged at least one sealing plate at least one bleeding point, it is at least one be arranged on sealing plate on wrap
Call prisoners in after letting them out for exercise case and at least one pumping blower fan of network bleeding point；The entrance of pumping blower fan is connected with case of calling prisoners in after letting them out for exercise by pump-line, is taken out
The outlet of gas blower fan is connected with air using pipeline by wind pipe；Described pumping control system includes the stream of pumping blower fan
Adjustment mechanism and device for pressure measurement are measured, or including being evacuated the flow rate adjusting mechanism and oxygen content measurement device of blower fan；Described pressure
Force measuring device includes pressure-measuring-point at fume side pressure-measuring-point and sealing；Described oxygen content measurement device contains sampled point, should
Sampled point, which is arranged on, calls prisoners in after letting them out for exercise on case, on pump-line or on wind pipe.
The another of the present invention is technically characterized in that：The hot air duct and sky that described air is utilized using pipeline including air
The cold air duct that gas utilizes；Described control system includes temperature measuring equipment and air-out flow adjusting means, described temperature
Measurement apparatus includes exhaust gas temperature measuring point and air temperature measuring point；Described air-out flow adjusting means includes wind pipe the
One flow control valve and wind pipe second flow regulating valve, the outlet for being evacuated blower fan are adjusted by wind pipe first flow respectively
The cold air duct that the hot air duct and air that section valve and wind pipe second flow regulating valve utilize with air utilize is connected.
The another of the present invention is technically characterized in that：Described control system includes control unit, described flow adjustment machine
Structure, air-out flow adjusting means, temperature measuring equipment, device for pressure measurement and oxygen content measurement device and control unit pass through signal
Line connects.
The invention provides the first adjusting method of the pumping controllable type rotary air preheater, it is characterised in that should
Method comprises the following steps：
1) setting pressure regulation threshold value e1 and e2, wherein e1 are less than 7kPa more than 0, and e2 is more than -7kPa and is less than 0；
2) pressure at flue gas lateral pressure and sealing is measured by device for pressure measurement；
3) pressure difference of fume side and pressure at sealing is compared, described pressure difference is equal to pressure measuring value at sealing and subtracts flue gas
Lateral pressure measured value；
4) threshold value is adjusted according to pressure difference and pressure, it is determined that and export the regulating command of pumping compressor flow adjustment mechanism, when
When pressure difference is more than the e1 of setting, the output of increase pumping blower fan, when pressure difference is less than the e2 of setting, reduce going out for pumping blower fan
Power.
The invention provides second of adjusting method of described pumping controllable type rotary air preheater, it is characterised in that
This method comprises the following steps：
1) the oxygen amount reference value of local air is set as Y, and setting oxygen flow regulation threshold value Y1 and Y2, it is small that described Y1 is more than 0
It is less than Y more than 0.9Y in Y, described Y2, Y1 is less than Y2；
2) by oxygen content measurement measurement device call prisoners in after letting them out for exercise case, in pump-line or wind pipe air oxygen amount；
3) according to the relation of measurement oxygen amount and oxygen flow regulation threshold value, it is determined that and exporting the regulation of pumping blower fan adjustment mechanism and referring to
Order, when actual measurement oxygen amount is more than Y2, increase the output of pumping blower fan, when actual measurement oxygen amount is less than Y1, reduces and be evacuated blower fan output.
The invention provides the third adjusting method of described pumping controllable type rotary air preheater, it is characterised in that
This method comprises the following steps：
1) set pressure regulation threshold value e1 and e2, e1 are less than 7kPa more than 0, e2 is more than -7kPa and is less than 0；
2) pressure at flue gas lateral pressure and sealing is measured by device for pressure measurement；
3) pressure difference of fume side and pressure at sealing is compared, described pressure difference is equal to pressure measuring value at sealing and subtracts flue gas
Lateral pressure measured value；
4) relation of threshold value is adjusted according to pressure difference and pressure, it is determined that and exporting the regulation of pumping compressor flow adjustment mechanism and referring to
Order, when pressure difference is more than the e1 of setting, the output of increase pumping blower fan, when pressure difference is less than the e2 of setting, reduce pumping blower fan
Output；
5) set exhaust gas temperature reference value t1 and cold air reference value t2, t1 are more than 80 DEG C less than 200 DEG C, t2 is more than 0 DEG C
Less than 100 DEG C；
6) the numerical value T15 of exhaust gas temperature measuring point and the numerical value T16 of air temperature measuring point are measured by temperature measuring equipment；
7) according to T15, T16, t1 and t2, it is determined that and exporting wind pipe flow control valve with being evacuated compressor flow adjustment machine
The regulating command of structure, when T15 is more than t1 and T16 is more than t2, wind pipe first flow regulating valve standard-sized sheet, wind pipe second
Flow control valve is fully closed；When T15+T16 is more than t1+t2, wind pipeline first flow regulating valve is first outputed, when wind pipe first
During flow control valve standard-sized sheet, then close wind pipe second flow regulating valve；When T15+T16 is less than or equal to t1+t2, wind is first outputed
Pipeline second flow regulating valve, when wind pipe second flow regulating valve standard-sized sheet, then wind pipe first flow regulating valve is closed,
When wind pipe first flow regulating valve is fully closed, it is further added by being evacuated the output of blower fan.
The invention provides the 4th kind of adjusting method of described pumping controllable type rotary air preheater, it is characterised in that
This method comprises the following steps：
1) the oxygen amount reference value of local air is set as Y, and setting oxygen flow regulation threshold value Y1 and Y2, it is small that described Y1 is more than 0
It is less than Y more than 0.9Y in Y, described Y2, Y1 is less than Y2；
2) by oxygen content measurement measurement device call prisoners in after letting them out for exercise case, in pump-line or wind pipe air oxygen amount；
3) according to the relation of measurement oxygen amount and oxygen flow regulation threshold value, it is determined that and exporting the regulation of pumping blower fan adjustment mechanism and referring to
Order, when actual measurement oxygen amount is more than Y2, increase the output of pumping blower fan, when actual measurement oxygen amount is less than Y1, reduces and be evacuated blower fan output；
4) set exhaust gas temperature reference value t1 and cold air reference value t2, t1 are more than 80 DEG C less than 200 DEG C, t2 is more than 0 DEG C
Less than 100 DEG C；
5) the numerical value T15 of exhaust gas temperature measuring point and the numerical value T16 of air temperature measuring point are measured by temperature measuring equipment；
6) according to T15, T16 and t1 and t2 relation, it is determined that and exporting wind pipe flow control valve with being evacuated blower fan stream
The regulating command of adjustment mechanism is measured, when T15 is more than t1 and T16 is more than t2, wind pipe first flow regulating valve standard-sized sheet, air-out
Pipeline second flow regulating valve is fully closed；When T15+T16 is more than t1+t2, wind pipeline first flow regulating valve is first outputed, works as air-out
During pipeline first flow regulating valve standard-sized sheet, then close wind pipe second flow regulating valve；When T15+T16 is less than or equal to t1+t2,
Wind pipeline second flow regulating valve is first outputed, when wind pipe second flow regulating valve standard-sized sheet, then to close wind pipe first-class
Adjustable valve, when wind pipe first flow regulating valve is fully closed, it is further added by being evacuated the output of blower fan.
The present invention compared with prior art, has the technique effect of advantages below and high-lighting：1., can by extract system
To be adjusted to the moderate pressure of sealing plate opening, so as to reduce or even remove smoke side and the pressure difference at bleeding point, reach drop
The effect that low or even elimination is leaked out.It is in theory if the pressure of bleeding point is adjusted to fairly horizontal with flue gas lateral pressure, then empty
The air leak rate of air curtain of air preheater is zero.2. by control system, pumping blower fan can be carried out with the pressure difference of fume side according at sealing
Automatically control, so as to ensure air leak rate of air preheater under operation the moment be maintained close to zero operating mode.3. pass through control
System processed, it can be utilized according to temperature and exhaust gas temperature the adjustment pumping of cold air with air to the hot air duct that air utilizes cold
The assignment of traffic of wind pipeline, cold snap back-end ductwork anti-corrosion can be achieved and convert efficient automatically control with energy.
Brief description of the drawings
Fig. 1 is a kind of principle schematic diagram for being evacuated controllable type rotary air preheater provided by the invention.
Fig. 2 is bleeding point partial cutaway schematic.
In figure：1- shells；2- exhaust gases passes；3- air ducts；4- rotors；5- sealing plates；6- diaphragm seals；7- bleeding points；
8- calls prisoners in after letting them out for exercise case；9- pump-lines；10- is evacuated blower fan；11- wind pipes；The hot air duct that 12a- air utilizes；12b- air profit
Cold air duct；13a- fume side pressure-measuring-points；Pressure-measuring-point at 13b- sealings；14- oxygen content measurement devices；15- smoke evacuation temperature
Spend measuring point；16- air temperature measuring points；17- wind pipe first flow regulating valves；18- wind pipe second flow regulating valves；
19- is evacuated the flow rate adjusting mechanism of blower fan.
Embodiment
Operation principle, concrete structure and the implementation of the present invention are described further below in conjunction with the accompanying drawings：
Fig. 1 is a kind of principle schematic diagram for being evacuated controllable type rotary air preheater provided by the invention, and its is basic
Structure includes shell 1, exhaust gases passes 2, air duct 3, rotor 4, sealing plate 5, diaphragm seal 6, the extract system of air preheater
And control system；The extract system includes being arranged at least one bleeding point 7 at least one sealing plate, at least one peace
Mounted in call prisoners in after letting them out for exercise case 8 and at least one pumping blower fan 10 of sealing plate coenvelope bleeding point；The entrance of pumping blower fan leads to case of calling prisoners in after letting them out for exercise
Cross pump-line 9 to connect, the outlet for being evacuated blower fan is connected with air using pipeline by wind pipe 11；Described pumping control
System includes the flow rate adjusting mechanism 19 and device for pressure measurement of pumping blower fan, or device for pressure measurement is replaced with into oxygen content measurement
Device 14；Wherein device for pressure measurement includes pressure-measuring-point 13b at fume side pressure-measuring-point 13a and sealing；Described oxygen amount is surveyed
The sampled point of amount device 14, which is arranged on, calls prisoners in after letting them out for exercise on case 8, on pump-line 9 or on wind pipe 11.Described air utilizes pipeline
The cold air duct 12b that the hot air duct 12a and air utilized including air is utilized；Described control system fills including temperature survey
Put includes exhaust gas temperature measuring point and air temperature measuring point with air-out flow adjusting means, described temperature measuring equipment；It is described
Air-out flow adjusting means include wind pipe first flow regulating valve and wind pipe second flow regulating valve, be evacuated blower fan
Outlet respectively utilized by wind pipe first flow regulating valve 17 and wind pipe second flow regulating valve 18 with air
Hot air duct 12a is connected with the cold air duct 12b that air utilizes.
Automatically controlled to realize, described control system may also include control unit, described flow rate adjusting mechanism, go out
Distinguished and admirable quantity regulating device, temperature measuring equipment, device for pressure measurement and oxygen content measurement device and control unit are connected by signal wire
Connect.Control unit can use computer, microprocessor or PLC etc..
For a kind of pumping controllable type rotary air preheater proposed by the present invention, it is possible to achieve following several different tune
Section method.The first adjusting method is the flow rate adjusting mechanism using device for pressure measurement and pumping blower fan, i.e., according to fume side
It is adjusted with the pressure difference of pressure at sealing, it comprises the following steps：
1) set pressure regulation threshold value e1 and e2, e1 are less than 7kPa more than 0, e2 is more than -7kPa and is less than 0；
2) pressure at flue gas lateral pressure and sealing is measured by device for pressure measurement；
3) pressure difference of fume side and pressure at sealing is compared, described pressure difference is equal to pressure measuring value at sealing and subtracts flue gas
Lateral pressure measured value；
4) threshold value is adjusted according to pressure difference and pressure, it is determined that and export the regulating command of pumping compressor flow adjustment mechanism, when
When pressure difference is more than setting deviation e1, the output of increase pumping blower fan, when pressure difference is less than setting deviation e2, reduce going out for blower fan
Power.
Second of adjusting method is the flow rate adjusting mechanism using oxygen content measurement device and pumping blower fan, i.e., according to local big
The oxygen content of gas is adjusted, and its method comprises the following steps：
1) the oxygen amount reference value of local air is set as Y, sets oxygen flow regulation threshold value Y1, Y2, and described Y1 is less than more than 0
Y, described Y2 are less than Y more than 0.9Y, and Y1 is less than Y2；
2) by oxygen content measurement measurement device call prisoners in after letting them out for exercise case, in pump-line or wind pipe air oxygen amount；
3) according to the relation of measurement oxygen amount and oxygen flow regulation threshold value, it is determined that and exporting the regulation of pumping blower fan adjustment mechanism and referring to
Order, when actual measurement oxygen amount is more than Y2, the output of increase pumping blower fan, when actual measurement oxygen amount is less than Y1, reduce blower fan output.
The third adjusting method be using device for pressure measurement, temperature measuring equipment, pumping compressor flow adjustment mechanism with
And air-out flow regulating valve is adjusted, it comprises the following steps：
1) set pressure regulation threshold value e1 and e2, e1 are less than 7kPa more than 0, e2 is more than -7kPa and is less than 0；
2) pressure at flue gas lateral pressure and sealing is measured by device for pressure measurement；
3) pressure difference of fume side and pressure at sealing is compared, described pressure difference is equal to pressure measuring value at sealing and subtracts flue gas
Lateral pressure measured value；
4) relation of threshold value is adjusted according to pressure difference and pressure, it is determined that and exporting the regulation of pumping compressor flow adjustment mechanism and referring to
Order, when pressure difference is more than setting deviation e1, the output of increase pumping blower fan, when pressure difference is less than setting deviation e2, reduce blower fan
Output；
5) set exhaust gas temperature reference value t1 and cold air reference value t2, t1 are more than 80 DEG C less than 200 DEG C, t2 is more than 0 DEG C
Less than 100 DEG C；
6) the numerical value T15 of exhaust gas temperature measuring point and the numerical value T16 of air temperature measuring point are measured by temperature measuring equipment；
7) according to T15, T16, t1 and t2, it is determined that and exporting wind pipe flow control valve with being evacuated compressor flow adjustment machine
The regulating command of structure, when T15, which is more than t1 and T16, is more than t2, the standard-sized sheet of wind pipe first flow regulating valve 17, wind pipe the
Two flow control valves 18 are fully closed；When T15+T16 is more than t1+t2, wind pipeline first flow regulating valve 17 is first outputed, works as discharge pipe
During road first flow 17 standard-sized sheet of regulating valve, then close wind pipe second flow regulating valve 18；When T15+T16 is less than or equal to t1+t2
When, wind pipeline second flow regulating valve 18 is first outputed, when wind pipe second flow 18 standard-sized sheet of regulating valve, then closes wind pipe
First flow regulating valve 17, when wind pipe first flow regulating valve 17 is fully closed, it is further added by being evacuated the output of blower fan 10.
4th kind of adjusting method be using oxygen content measurement device, temperature measuring equipment, pumping compressor flow adjustment mechanism and
Air-out flow regulating valve is adjusted, and it comprises the following steps：
1) the oxygen amount reference value of local air is set as Y, and setting oxygen flow regulation threshold value (Y1, Y2), it is small that described Y1 is more than 0
It is less than Y more than 0.9Y in Y, described Y2, Y1 is less than Y2；
2) by oxygen content measurement measurement device call prisoners in after letting them out for exercise case, in pump-line or wind pipe air oxygen amount；
3) according to the relation of measurement oxygen amount and oxygen flow regulation threshold value, it is determined that and exporting the regulation of pumping blower fan adjustment mechanism and referring to
Order, when actual measurement oxygen amount is more than Y2, the output of increase pumping blower fan, when actual measurement oxygen amount is less than Y1, reduce blower fan output；
4) set exhaust gas temperature reference value t1 and cold air reference value t2, t1 are more than 80 DEG C less than 200 DEG C, t2 is more than 0 DEG C
Less than 100 DEG C；
5) the numerical value T15 of exhaust gas temperature measuring point 15 and the numerical value of air temperature measuring point 16 are measured by temperature measuring equipment
T16；
6) according to T15, T16 and t1 and t2 relation, it is determined that and exporting wind pipe flow control valve with being evacuated blower fan stream
The regulating command of adjustment mechanism is measured, when T15 is more than t1 and T16 is more than t2, the standard-sized sheet of wind pipe first flow regulating valve 17, is gone out
Wind pipeline second flow regulating valve 18 is fully closed, when T15+T16 is more than t1+t2, first outputs wind pipeline first flow regulating valve 17,
When wind pipe first flow 17 standard-sized sheet of regulating valve, then close wind pipe second flow regulating valve 18, when T15+T16 be less than etc.
When t1+t2, wind pipeline second flow regulating valve 18 is first outputed, when wind pipe second flow 18 standard-sized sheet of regulating valve, then is closed
Wind pipe first flow regulating valve 17, when wind pipe first flow regulating valve 17 is fully closed, it is further added by being evacuated going out for blower fan
Power.
Fig. 2 is the bleeding point partial structural diagram of the present invention, and it is original that its basic structure includes air preheater
Bag is set on the outside of the bleeding point 7 and bleeding point that rotor 4, diaphragm seal 5, sealing plate 6 and the present invention propose to output on sealing plate
The case 8 of calling prisoners in after letting them out for exercise of network bleeding point.Generally between sealing plate and rotor at least a pair of sealing teeth to realize double containment, this hair
The bright bleeding point 7 opened by being evacuated blower fan, pump-line and case of calling prisoners in after letting them out for exercise from sealing plate is evacuated so that sealing plate is close to be turned
The air pressure of sub- side reduces, and so as to reduce air and the pressure difference of flue gas lateral pressure at this, and then reduces letting out for the lateral fume side of air
Dew amount.Ideally, when the pressure of sealing plate rotor-side is equal to flue gas lateral pressure, then the air leak rate of air curtain at this is zero.The present invention
By the pressure for adjusting the flow rate adjusting mechanism of blower fan to control at sealing, and it is allowed to be equal to flue gas lateral pressure as far as possible, it is most with this
Amount cause sealing at air to the air leak rate of air curtain of fume side be zero.
Claims (6)
1. one kind pumping controllable type rotary air preheater, described air preheater include shell (1), exhaust gases passes (2), sky
Gas passage (3), rotor (4), sealing plate (5) and diaphragm seal (6), it is characterised in that：The rotary air preheater also includes pumping
System and control system, the extract system include being arranged at least one bleeding point (7) at least one sealing plate, at least
One case of calling prisoners in after letting them out for exercise (8) for being arranged on sealing plate coenvelope bleeding point and at least one pumping blower fan (10)；It is evacuated the entrance of blower fan
Case is connected by pump-line (9) with calling prisoners in after letting them out for exercise, and the outlet for being evacuated blower fan is connected with air using pipeline by wind pipe (11)；
Described pumping control system includes the flow rate adjusting mechanism (19) and device for pressure measurement of pumping blower fan, or including being evacuated blower fan
Flow rate adjusting mechanism (19) and oxygen content measurement device (14)；Described device for pressure measurement includes fume side pressure-measuring-point
Pressure-measuring-point (13b) at (13a) and sealing；Described oxygen content measurement device (14) contains sampled point, and the sampled point is arranged on receipts
On bellows, on pump-line or on wind pipe；
The cold air duct (12b) that the hot air duct (12a) and air that described air is utilized using pipeline including air utilize；Institute
The control system stated includes temperature measuring equipment and air-out flow adjusting means, and described temperature measuring equipment includes exhaust gas temperature
Measuring point (15) and air temperature measuring point (16)；Described air-out flow adjusting means includes wind pipe first flow regulating valve
(17) and wind pipe second flow regulating valve (18), the outlet of blower fan is evacuated respectively by wind pipe first flow regulating valve
And the cold air duct that utilizes of the hot air duct (12a) that utilizes of wind pipe second flow regulating valve (18) and air and air (17)
(12b) is connected.
2. according to a kind of pumping controllable type rotary air preheater described in claim 1, it is characterised in that：Described control system
System includes control unit, described flow rate adjusting mechanism (19), air-out flow adjusting means, temperature measuring equipment, pressure measxurement
Device and oxygen content measurement device are connected with control unit by signal wire.
A kind of 3. adjusting method using pumping controllable type rotary air preheater as claimed in claim 1, it is characterised in that
This method comprises the following steps：
1) setting pressure regulation threshold value e1 and e2, wherein e1 are less than 7kPa more than 0, and e2 is more than -7kPa and is less than 0；
2) pressure at flue gas lateral pressure and sealing is measured by device for pressure measurement；
3) pressure difference of fume side and pressure at sealing is compared, described pressure difference is equal to pressure measuring value at sealing and subtracts flue gas side pressure
Power measured value；
4) threshold value is adjusted according to pressure difference and pressure, it is determined that and export the regulating command of pumping compressor flow adjustment mechanism, work as pressure difference
More than setting e1 when, increase pumping blower fan output, when pressure difference be less than setting e2 when, reduce pumping blower fan output.
A kind of 4. adjusting method using pumping controllable type rotary air preheater as claimed in claim 1, it is characterised in that
This method comprises the following steps：
1) the oxygen amount reference value of local air is set as Y, setting oxygen flow regulation threshold value Y1 and Y2, described Y1 are less than Y more than 0,
Described Y2 is less than Y more than 0.9Y, and Y1 is less than Y2；
2) by oxygen content measurement measurement device call prisoners in after letting them out for exercise case, in pump-line or wind pipe air oxygen amount；
3) according to the relation of measurement oxygen amount and oxygen flow regulation threshold value, it is determined that and export the regulating command of pumping blower fan adjustment mechanism,
When actual measurement oxygen amount is more than Y2, the output of increase pumping blower fan, when actual measurement oxygen amount is less than Y1, reduction is evacuated blower fan and contributed.
A kind of 5. adjusting method using pumping controllable type rotary air preheater as claimed in claim 1, it is characterised in that
This method comprises the following steps：
1) set pressure regulation threshold value e1 and e2, e1 are less than 7kPa more than 0, e2 is more than -7kPa and is less than 0；
2) pressure at flue gas lateral pressure and sealing is measured by device for pressure measurement；
3) pressure difference of fume side and pressure at sealing is compared, described pressure difference is equal to pressure measuring value at sealing and subtracts flue gas side pressure
Power measured value；
4) relation of threshold value is adjusted according to pressure difference and pressure, it is determined that and export the regulating command of pumping compressor flow adjustment mechanism,
When pressure difference is more than the e1 of setting, the output of increase pumping blower fan, when pressure difference is less than the e2 of setting, reduce going out for pumping blower fan
Power；
5) set exhaust gas temperature reference value t1 and cold air reference value t2, t1 are more than 80 DEG C less than 200 DEG C, t2 is less than more than 0 DEG C
100℃；
6) the numerical value T15 of exhaust gas temperature measuring point and the numerical value T16 of air temperature measuring point are measured by temperature measuring equipment；
7) according to T15, T16, t1 and t2, it is determined that and exporting wind pipe flow control valve with being evacuated compressor flow adjustment mechanism
Regulating command, when T15 is more than t1 and T16 is more than t2, wind pipe first flow regulating valve (17) standard-sized sheet, wind pipe second
Flow control valve (18) is fully closed；When T15+T16 is more than t1+t2, wind pipeline first flow regulating valve (17) is first outputed, works as air-out
During pipeline first flow regulating valve (17) standard-sized sheet, then close wind pipe second flow regulating valve (18)；When T15+T16 is less than or equal to
During t1+t2, wind pipeline second flow regulating valve (18) is first outputed, when wind pipe second flow regulating valve (18) standard-sized sheet, then
Wind pipe first flow regulating valve (17) is closed, when wind pipe first flow regulating valve (17) is fully closed, is further added by being evacuated wind
The output of machine.
A kind of 6. adjusting method using pumping controllable type rotary air preheater as claimed in claim 1, it is characterised in that
This method comprises the following steps：
1) the oxygen amount reference value of local air is set as Y, setting oxygen flow regulation threshold value Y1 and Y2, described Y1 are less than Y more than 0,
Described Y2 is less than Y more than 0.9Y, and Y1 is less than Y2；
2) by oxygen content measurement measurement device call prisoners in after letting them out for exercise case, in pump-line or wind pipe air oxygen amount；
3) according to the relation of measurement oxygen amount and oxygen flow regulation threshold value, it is determined that and export the regulating command of pumping blower fan adjustment mechanism,
When actual measurement oxygen amount is more than Y2, the output of increase pumping blower fan, when actual measurement oxygen amount is less than Y1, reduction is evacuated blower fan and contributed；
4) set exhaust gas temperature reference value t1 and cold air reference value t2, t1 are more than 80 DEG C less than 200 DEG C, t2 is less than more than 0 DEG C
100℃；
5) the numerical value T15 of exhaust gas temperature measuring point (15) and the numerical value of air temperature measuring point (16) are measured by temperature measuring equipment
T16；
6) according to T15, T16 and t1 and t2 relation, it is determined that and exporting wind pipe flow control valve with being evacuated compressor flow tune
The regulating command of complete machine structure, when T15 is more than t1 and T16 is more than t2, wind pipe first flow regulating valve (17) standard-sized sheet, air-out
Pipeline second flow regulating valve (18) is fully closed；When T15+T16 is more than t1+t2, wind pipeline first flow regulating valve is first outputed
(17), when wind pipe first flow regulating valve (17) standard-sized sheet, then wind pipe second flow regulating valve (18) is closed；Work as T15+
When T16 is less than or equal to t1+t2, wind pipeline second flow regulating valve (18) is first outputed, when wind pipe second flow regulating valve
(18) during standard-sized sheet, then wind pipe first flow regulating valve (17) is closed, when wind pipe first flow regulating valve (17) is fully closed,
It is further added by being evacuated the output of blower fan.
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| CN201510406414.9A CN105180202B (en) | 2015-07-10 | 2015-07-10 | One kind pumping controllable type rotary air preheater and its adjusting method |
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| CN110094752A (en) * | 2019-05-29 | 2019-08-06 | 西安热工研究院有限公司 | A kind of automatic control air preheater sealing and anti-blocking system and control method |
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|---|---|---|---|---|
| CN201387026Y (en) * | 2009-04-08 | 2010-01-20 | 卫辰西 | Low-leakage extraction compensation device |
| CN201507943U (en) * | 2009-10-15 | 2010-06-16 | 北京哈宜节能环保科技开发有限公司 | Guiding-type leakage control circulating reutilization system |
| CN102213708A (en) * | 2011-04-09 | 2011-10-12 | 山东电力研究院 | Method for testing air leak rate of air preheater |
| CN103105269A (en) * | 2011-11-09 | 2013-05-15 | 华北电力科学研究院有限责任公司 | Measuring method of air leakage rate of primary air of air pre-heater |
| CN204853538U (en) * | 2015-07-10 | 2015-12-09 | 清华大学 | Gyration air heater with adjustable bleed |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8627878B2 (en) * | 2009-09-11 | 2014-01-14 | Alstom Technology Ltd | System and method for non-contact sensing to minimize leakage between process streams in an air preheater |
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- 2015-07-10 CN CN201510406414.9A patent/CN105180202B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201387026Y (en) * | 2009-04-08 | 2010-01-20 | 卫辰西 | Low-leakage extraction compensation device |
| CN201507943U (en) * | 2009-10-15 | 2010-06-16 | 北京哈宜节能环保科技开发有限公司 | Guiding-type leakage control circulating reutilization system |
| CN102213708A (en) * | 2011-04-09 | 2011-10-12 | 山东电力研究院 | Method for testing air leak rate of air preheater |
| CN103105269A (en) * | 2011-11-09 | 2013-05-15 | 华北电力科学研究院有限责任公司 | Measuring method of air leakage rate of primary air of air pre-heater |
| CN204853538U (en) * | 2015-07-10 | 2015-12-09 | 清华大学 | Gyration air heater with adjustable bleed |
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